Bow Wow to Mike Vick.

Bad news for Mike Vick … his friend Bow Wow won’t be helping him sell special hair brushes to black people … after a high-profile business deal fell through, TMZ Sports has learned. It was just last year that Vick announced plans to release a line of “wave brushes” called WaveMasterz — brushes that come complete with a mirror on the back so users can ensure they look fresh at all times.

Bow Wow was reportedly involved in the project … and at one point, his name was on the top of the WaveMasterz website … but now, the rapper tells us the plans have changed.

“It was supposed to go down,” Bow Wow said … “but all deals don’t go down the way you want them to.”

Bow Wow says he didn’t want to spread himself too thin — since he’s already involved in a clothing line, a vodka line and hosting “106 and Park” on BET.

BW — who was at Last Kings clothing store in L.A. — said there are no hard feelings between him and the QB … explaining, “Michael Vick is still a close friend of mine, I wish him the best.”